L4990, L4990A, L4990AD Selling Leads, Datasheet
MFG:ST Package Cooled:DIP D/C:99+
L4990, L4990A, L4990AD
- Table of contents:
Info of L4990
Info of L4990A
Info of L4990AD
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About L4990
PDF/DataSheet Download
Datasheet: L4990
File Size: 330013 KB
Manufacturer: STMicro
Download : Click here to Download
About L4990A
PDF/DataSheet Download
Datasheet: L4990A
File Size: 330013 KB
Manufacturer: STMicro
Download : Click here to Download
About L4990AD
PDF/DataSheet Download
Datasheet: L4990AD
File Size: 330013 KB
Manufacturer: STMICROELECTRONICS [STMicroelectronics]
Download : Click here to Download
L4990 General Description
This primary controller I.C., developed in BCD60II technology, has been designed to implement off line or DC-DC power supply applications using a fixed frequency current mode control.
Based on a standard current mode PWM controller this device includes some features as programmable soft start, IN/OUT synchronization, disable (to be used for over voltage protection and for power management), precise maximum Duty Cycle Control, 100ns (typ) leading edge blanking on current sense, pulse by pulse current limit and overcurrent protection with soft start intervention.
L4990 Maximum Ratings
| Symbol | Parameter | Value | Unit |
| VCC | Supply Voltage (ICC < 50mA) (*) | selflimit | V |
| IOUT | Output Peak Pulse Current | 1.5 | A |
| Analog Inputs & Outputs (6,7) | -0.3 to 8 | V | |
| Analog Inputs & Outputs (1,2,3,4,5,15,14 13) | -0.3 to 6 | V | |
| Ptot | Power Dissipation @ Tamb = 70°C | 1 | W |
| Tj | Junction Temperature, Operating Range | -25 to 125 | °C |
| Tstg | Storage Temperature, Operating Range | -55 to 150 | °C |
L4990 Connection Diagram
L4990A General Description
This primary controller I.C., developed in BCD60II technology, has been designed to implement off line or DC-DC power supply applications using a fixed frequency current mode control.
Based on a standard current mode PWM controller this device includes some features as programmable soft start, IN/OUT synchronization, disable (to be used for over voltage protection and for power management), precise maximum Duty Cycle Control, 100ns (typ) leading edge blanking on current sense, pulse by pulse current limit and overcurrent protection with soft start intervention.
L4990A Maximum Ratings
| Symbol | Parameter | Value | Unit |
| VCC | Supply Voltage (ICC < 50mA) (*) | selflimit | V |
| IOUT | Output Peak Pulse Current | 1.5 | A |
| Analog Inputs & Outputs (6,7) | -0.3 to 8 | V | |
| Analog Inputs & Outputs (1,2,3,4,5,15,14 13) | -0.3 to 6 | V | |
| Ptot | Power Dissipation @ Tamb = 70°C | 1 | W |
| Tj | Junction Temperature, Operating Range | -25 to 125 | °C |
| Tstg | Storage Temperature, Operating Range | -55 to 150 | °C |
L4990A Connection Diagram
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